You do realize asshole Republicans reverted before it could be more than implemented on a couple of highways
“Metric supporters argued the road signs were a crucial step in helping Americans get over any psychological blocks to switching measurement systems. But Republican Charles Grassley, then a congressman and now a senator from Iowa, killed proposed federal regulations that would have forced states to put up signs in kilometers.”
They literally locked putting up signs in both metric an Imperial
Also… remember my comment about old fucks raised on gas lead fumes…. Yea, the 70s……